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Disintegrated Waste-Activated Sludge (NO 2 /FNA Method) as a Source of Carbon for Denitrification in the Mainstream of a WWTP

Author

Listed:
  • Dorota Szypulska

    (Faculty of Environmental Engineering, Wroclaw University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wroclaw, Poland)

  • Kamil Janiak

    (Faculty of Environmental Engineering, Wroclaw University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wroclaw, Poland
    Wroclaw Municipal Water and Sewage Company, Na Grobli 14/16, 50-421 Wroclaw, Poland)

  • Bartosz Zięba

    (Faculty of Environmental Engineering, Wroclaw University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wroclaw, Poland)

  • Anna Wizimirska

    (Faculty of Environmental Engineering, Wroclaw University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wroclaw, Poland)

  • Marek Mołczan

    (Faculty of Environmental Engineering, Wroclaw University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wroclaw, Poland)

  • Sławomir Szerzyna

    (Wroclaw Municipal Water and Sewage Company, Na Grobli 14/16, 50-421 Wroclaw, Poland)

  • Renata Tomczak-Wandzel

    (Aquateam COWI, Karvesvingen 2, 0579 Oslo, Norway)

Abstract

The deficiency of readily biodegradable organic carbon can be a significant limitation to effective nitrogen removal during wastewater denitrification. Waste-activated sludge (WAS) is a source of carbon produced directly at wastewater treatment plants (WWTPs). Raw WAS has a large molecular weight and complex chemical structure molecules that are not easily available for microorganisms. In this study, easily biodegradable organic fractions were released using pH control and/or nitrites and nitric acid (NO 2 /FNA). The obtained results indicated that WAS can be a sufficient carbon source for denitrification in WWTPs that are at risk of minor effluent violations. The implementation of WAS disintegration with the use of pH control and NO 2 /FNA allowed for the denitrification of an additional 0.5 and 0.8 mgN-NO 3 /L. WAS disintegration, besides being a source of carbon generation, reduces the volume of sludge and leads to the implementation of a closed-loop system.

Suggested Citation

  • Dorota Szypulska & Kamil Janiak & Bartosz Zięba & Anna Wizimirska & Marek Mołczan & Sławomir Szerzyna & Renata Tomczak-Wandzel, 2024. "Disintegrated Waste-Activated Sludge (NO 2 /FNA Method) as a Source of Carbon for Denitrification in the Mainstream of a WWTP," Resources, MDPI, vol. 13(6), pages 1-15, June.
    • Handle: RePEc:gam:jresou:v:13:y:2024:i:6:p:80-:d:1412137
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